Cassie's life is far from ordinary. Her best friends are a coven of witches and her relationship with her boyfriend, Adam, is written in the stars. As the leader of the Secret Circle, it is up to her to keep them safe.
But then Cassie's evil half sister surfaces, determined to take Cassie's place in the Secret Circle. And a band of powerful witch-hunters begins targeting the group, determined to destroy them. Will the circle remain intact despite the powerfully evil magic that has infiltrated their ring? And will Cassie survive this ultimate battle between good and evil?